Hotfix 5.00c includes fixes for save games, audio, and some graphical issues. The publication refers to the Steam version of The Witcher 3: Wild Hunt - Remastered.
If the error is related to saves, first make a backup copy of them, then install the update and repeat the previous scenario. Do not automatically transfer withdrawals to another platform or game version. When using mods, check their compatibility with the new build number. The exact list of fixes and remaining restrictions are available in the developer message.
Sources and checks
Hotfix 5.00c is out now! · Steam